After 2 years of examination the U.S Patent and Trademark Office has reversed its two earlier unofficial decisions and decided that Microsoft's File Allocation Table file system constitutes a "novel and non-obvious" system enabling it to be patented. This coupled with Microsofts plans to charge licensing fees for use of the system could cause many problems for open-source operating systems that implement the file system, or even to mp3 players. Elsewhere, APCMag.com has an interview with Microsoft's "open source point man" Martin Gregory.